When the disks are in raid1, you might be able to mount a single disk using ext2 ifs. However, when the disks are raid0 or jbod (span), you'll need Linux. Just connect both disks to your computer, and boot it from a recent Ubuntu Live CD or -USB stick, and everything will be done automagically.

Do NOT let Windows 'initialize' the disk(s). "Initializing a disk" is Microsoft speak for "Deleting whatever is on the disk and just put a fresh NTFS filesystem on it".